This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 5 | 5 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 90 |
| 11 | 220 |
| 12 | 264 |
| 13 | 312 |
| 14 | 364 |
| 15 | 3360 |
| 16 | 11280 |
| 17 | 26656 |
| 18 | 47430 |
| 19 | 74556 |
| 20 | 246240 |
| 21 | 824040 |
| 22 | 2242086 |
| 23 | 5166260 |
| 24 | 10272168 |
| 25 | 26698800 |
| 26 | 81381300 |
| 27 | 233188956 |
| 28 | 593255880 |
| 29 | 1353111928 |
| 30 | 3416572650 |
| 31 | 9872919060 |
| 32 | 28825911968 |
| 33 | 78295457856 |
| 34 | 194146795920 |
| 35 | 496358103500 |